Oral appliance



FIG. 1 is a perspective view of the oral appliance;

FIG. 2 is a side elevation view of the oral appliance;

FIG. 3 is a front elevation view of the oral appliance;

FIG. 4 is a rear elevation view of the oral appliance;

FIG. 5 is a top plan view of the oral appliance; and,

FIG. 6 is a bottom plan view of the oral appliance. 

CLAIM The ornamental design for the oral appliance, as shown and described. 